defmodule HelloWorld do
	def hello(name \\"world") do
		IO.puts "hello,#{name}!"
	end
	def fac(0) do 1 end 
	def fac(n) do n*fac(n-1) end 
end
HelloWorld.hello("gerry xiao")
result=HelloWorld.fac(32)
IO.puts "#{result}"
result=[]
result=[{:name, :gerry}|result]
#IO.puts "#{result}"
:io.format("the result is %w",result)


